JP3010211B1 - Welding method - Google Patents
Welding methodInfo
- Publication number
- JP3010211B1 JP3010211B1 JP25390398A JP25390398A JP3010211B1 JP 3010211 B1 JP3010211 B1 JP 3010211B1 JP 25390398 A JP25390398 A JP 25390398A JP 25390398 A JP25390398 A JP 25390398A JP 3010211 B1 JP3010211 B1 JP 3010211B1
- Authority
- JP
- Japan
- Prior art keywords
- welding
- weld
- residual stress
- carbon dioxide
- welding method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Arc Welding In General (AREA)
Abstract
【要約】
【課題】 溶接金属の溶込みを深くして、溶接止端部に
誘起させる圧縮残留応力を容易に大きくすることがで
き、疲労強度の向上や溶接割れの防止に効果的な、改善
された新しい溶接方法を提供する。
【解決手段】 溶接が完了する室温もしくはその付近で
マルテンサイト変態膨張が終了する溶接材料と炭酸ガス
含有シールドガスとを用いて被溶接金属にアーク溶接を
行う。Abstract: PROBLEM TO BE SOLVED: To deepen the penetration of a weld metal to easily increase a compressive residual stress induced at a weld toe, and to effectively improve fatigue strength and prevent weld cracking. To provide a new welding method. SOLUTION: Arc welding is performed on a metal to be welded using a welding material whose martensitic transformation expansion ends at or near room temperature at which welding is completed and a carbon dioxide-containing shielding gas.
Description
【０００１】[0001]
【発明の属する技術分野】この出願の発明は、溶接方法
に関するものである。さらに詳しくは、この出願の発明
は、疲労強度の向上や溶接割れを防止して溶接するのに
適した、構造物の補修溶接等としても有用な、新しいア
ーク溶接方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method. More specifically, the invention of this application relates to a new arc welding method suitable for welding while improving fatigue strength and preventing welding cracks, which is also useful as repair welding of structures and the like.
【０００２】[0002]
【従来の技術とその課題】従来、構造物の溶接、そして
補修時の溶接等においては、冷却に伴う収縮によって溶
接部に引張の残留応力が誘起され、溶接部の疲労強度が
著しく低下したり、溶接割れが生じるという問題が避け
られなかった。このような問題は、従来の溶接では、溶
接金属が溶接の最終段階の室温付近で収縮するため引張
残留応力が誘起され、その応力比効果で疲労強度が著し
く低下することにあった。また、その引張残留応力で割
れが誘起されることにあった。2. Description of the Related Art Conventionally, in welding or repairing a structure, a tensile residual stress is induced in a welded portion due to shrinkage due to cooling, and the fatigue strength of the welded portion is significantly reduced. However, the problem of weld cracking was inevitable. Such a problem is that in the conventional welding, the weld metal shrinks around room temperature in the final stage of welding, so that tensile residual stress is induced, and the fatigue strength is significantly reduced due to the stress ratio effect. In addition, a crack was induced by the tensile residual stress.
【０００３】そこで、この出願の発明は、以上のとおり
の従来技術の問題点を解消し、溶接金属の溶込みを深く
して、溶接止端部に誘起させる圧縮残留応力を容易に大
きくすることができ、疲労強度の向上や溶接割れの防止
に効果的な、改善された新しいアーク溶接方法を提供す
ることを課題としている。[0003] Accordingly, the invention of this application is to solve the above-mentioned problems of the prior art and to deepen the penetration of the weld metal to easily increase the compressive residual stress induced at the weld toe. It is an object of the present invention to provide an improved and improved arc welding method which is effective in improving fatigue strength and preventing welding cracks.
【０００４】[0004]
【課題を解決するための手段】この出願の発明は、上記
の課題を解決するために、第１には、溶接が完了する室
温もしくはその付近でマルテンサイト変態膨張が終了す
る溶接材料と炭酸ガス含有シールドガスとを用いて被溶
接金属にアーク溶接を行うことを特徴とする溶接方法を
提供する。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention of the present application firstly relates to a welding material and a carbon dioxide gas whose martensitic transformation expansion ends at or near room temperature at which welding is completed. A welding method characterized by performing arc welding on a metal to be welded using a contained shielding gas.
【０００５】また、この出願の発明は、前記方法につい
て、第２には、溶接材料は、ＮｉとＣｒとを含有する合
金とすることや、第３には、シールドガスは、炭酸ガス
を１０％以上含有し、不活性ガスを含有すること、第４
には、補修溶接として行うことも提供する。[0005] The invention of this application relates to the above method, in the second aspect, the welding material is an alloy containing Ni and Cr. Third, the shielding gas is a carbon dioxide gas containing 10%. % Or more and contains an inert gas.
Also provides that it can be performed as repair welding.
【０００６】[0006]
【発明の実施の形態】この出願の発明は、以上のとおり
の特徴をもつものであるが、原理的には、この発明の溶
接方法は、溶接材料の変態膨張を利用して、溶接部に圧
縮の溶接残留応力を導入し、その応力比効果で溶接部の
疲労強度を向上させ、また溶接割れが問題となる対象に
対しては溶接割れ起こすとなしに溶接することを可能と
しているものである。BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the above-mentioned features, but in principle, the welding method of the present invention uses a transformation expansion of a welding material to form a weld on a welding portion. It introduces compressive welding residual stress, improves the fatigue strength of the welded part by its stress ratio effect, and enables welding to be performed without causing weld cracking for objects where weld cracking is a problem. is there.
【０００７】溶接材料には、溶接が完了する室温もしく
はその付近でマルテンサイト変態膨張が終了するものを
用いる。このような溶接材料としては、ＮｉおよびＣｒ
とを含有する合金材料がより適当なものとして例示され
る。一般的には、化学組成（重量％）として、Ｎｉ：２
〜２０％、Ｃｒ：２〜２０、そしてＣ（炭素）：０．５
以下、Ｓｉ：０．５以下、Ｍｎ：２．０以下、Ｍｏ：
０．５以下のような鉄基合金であることが望ましい。As the welding material, a material whose martensitic transformation expansion ends at or near room temperature at which welding is completed is used. Such welding materials include Ni and Cr.
An alloy material containing the following is exemplified as a more suitable material. Generally, the chemical composition (% by weight) is Ni: 2
-20%, Cr: 2-20, and C (carbon): 0.5
Hereinafter, Si: 0.5 or less, Mn: 2.0 or less, Mo:
It is desirable that the iron-based alloy be 0.5 or less.
【０００８】もちろん必要に応じて、０．５％以下のＮ
ｂ，Ｔｉ，Ａｌ，Ｗ，Ｔａ，Ｖ，Ｈｆ，Ｚｒ等を添加し
てもよい。ただし、ＮｉおよびＣｒを除く、金属元素の
総割合は、５．０％以下とすることが好ましい。そし
て、溶接時のシールドガスは、この発明においては、炭
酸ガス（ＣＯ2 ）を含有するものとし、好ましくは、Ａ
ｒ（アルゴン）等の不活性ガスとの混合ガス、もしくは
この不活性ガスを混合していない炭酸ガスのみのものと
する。混合ガスとする場合には、炭酸ガス濃度は、少く
とも１０容量％以上、さらに好ましくは２０容量％以上
とする。最も好ましくは、１００％ＣＯ2 をシールドガ
スとする。[0008] Of course, if necessary, 0.5% or less of N
b, Ti, Al, W, Ta, V, Hf, Zr, etc. may be added. However, it is preferable that the total ratio of metal elements excluding Ni and Cr be 5.0% or less. In the present invention, the shielding gas at the time of welding contains carbon dioxide (CO 2 ).
A mixed gas with an inert gas such as r (argon) or a carbon dioxide gas not mixed with the inert gas is used. When a mixed gas is used, the concentration of carbon dioxide gas is at least 10% by volume or more, more preferably 20% by volume or more. Most preferably, 100% CO 2 is used as the shielding gas.
【０００９】溶接はアーク溶接により行うことになる。
この発明では、溶接素線に変態が室温付近で終了する材
料と、シールドガスに炭酸ガスを含むものを用い、溶接
金属が母材側に深く溶込む様にすることによって溶接止
端近傍の残留応力を容易に圧縮とすることを可能にして
いる。そして、溶接部の疲労強度を向上させ、また溶接
割れを防ぐ。The welding is performed by arc welding.
In the present invention, a material whose transformation is completed at around room temperature is used for the welding wire, and a material containing carbon dioxide gas as the shielding gas is used. This enables stress to be easily compressed. And it improves the fatigue strength of the welded portion and prevents weld cracking.
【００１０】そこで以下に実施例を示し、さらに詳しく
この発明の方法について説明する。[0010] Then, examples are shown below, and the method of the present invention will be described in more detail.
【００１１】[0011]
【実施例】図１に示したように、主鋼板（１）に付加物
（２）を角回溶接に溶接して継手構造を形成した。主鋼
板（１）の板厚は２０ｍｍ、板幅２４０ｍｍ、長さ８０
０ｍｍで、付加物（２）は、板厚２０ｍｍ、高さ５０ｍ
ｍ、長さ１５０ｍｍであり、付加物（２）の長手方向端
部中央を起点とし、反対方向端部中央までの溶接を左右
（Ａ）（Ｂ）で行った。溶接積層（３）は単層とした。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an additional structure (2) was welded to a main steel plate (1) by round welding to form a joint structure. The main steel plate (1) has a thickness of 20 mm, a width of 240 mm, and a length of 80
0mm, the additional product (2) is 20mm thick and 50m high
m, the length was 150 mm, and welding was performed on the left and right sides (A) and (B) from the center of the longitudinal end of the additional product (2) to the center of the opposite direction. The welding lamination (3) was a single layer.
【００１２】溶接材料素線は、直径１．２ｍｍでＣを
０．０２５重量％、Ｓｉを０．３２重量％、Ｍｎを０．
７０重量％、Ｎｉを１０重量％、Ｃｒを１０重量％、Ｍ
ｏを０．１３重量％含有する鉄基合金を用いた。マルテ
ンサイト変態を室温付近で終了し、図２の実線に示した
ように溶接金属に圧縮残留応力が誘起される合金であ
る。[0012] The welding material strand is 1.2 mm in diameter, 0.025% by weight of C, 0.32% by weight of Si, and 0.2% of Mn.
70% by weight, 10% by weight of Ni, 10% by weight of Cr, M
An iron-based alloy containing 0.13% by weight of o was used. It is an alloy in which the martensitic transformation is completed at around room temperature and a compressive residual stress is induced in the weld metal as shown by the solid line in FIG.
【００１３】シールドガスを変更して溶接を行った結果
を示したものが図３である。（ａ）９８％Ａｒと２％Ｏ
2 （従来のシールドガス）、（ｂ）８０％Ａｒと２０％
ＣＯ 2 、（ｃ）１００％ＣＯ2 の結果を示している。
（ｃ）の場合、板内面への溶込みが深くなっていること
がわかる。また、鋳造製品の引巣部を充填する肉盛り溶
接を実施したところ、従来の溶接で行った場合には溶接
引張残留応力のために溶接割れを生じるのに対し、この
発明の方法で同一の肉盛り溶接を行っても溶接割れは生
じなかった。なお、この実施例では引巣部を補修した
が、溶接欠陥部の補修に採用することもできる。Results of welding with changing shielding gas
Is shown in FIG. (A) 98% Ar and 2% O
Two(Conventional shielding gas), (b) 80% Ar and 20%
CO Two, (C) 100% COTwoShows the results.
In the case of (c), the penetration into the inner surface of the plate is deep
I understand. In addition, the build-up solution that fills the
When welding was performed by conventional welding, welding
In contrast to welding cracks due to tensile residual stress, this
Even if the same build-up welding is performed by the method of the invention, weld cracks
I didn't. In this example, the nest was repaired.
However, it can also be used for repairing welding defects.
【００１４】図４は疲労特性を表すＳ−Ｎ線図である。
従来溶接継ぎ手の疲労特性は丸印で表すように図の左側
に位置するのに対し、三角印で示すこの発明の方法を適
用した継手の特性は右側に位置し、この発明によって製
作した継手の疲労強度は従来のものに比べ向上してい
る。次にこの発明の方法で補修溶接し、疲労強度を向上
させた例を示す。まず、応力範囲１００ＭＰａ繰返しを
与えたところ、従来の継手は１．７２×１０5 回で疲労
き裂が生じた。そこで、このき裂部を除去してからこの
発明の方法で肉盛り補修して同一条件で繰返し応力を与
えたところ、４０倍の寿命に至ってもき裂の発生は起こ
らなかった。なお、補修前後の板幅に沿う溶接残留応力
の分布形態を示すと図５のようになる。従来継手では、
破線に示すように板幅中央の残留応力は引張であるのに
対し、本発明の方法で補修した後の溶接残留応力は板幅
中央で圧縮となっていることがわかる。FIG. 4 is an SN diagram showing fatigue characteristics.
While the fatigue characteristics of the conventional welding joint are located on the left side of the figure as indicated by the circles, the characteristics of the joints to which the method of the present invention is applied are indicated on the right side by the triangles, and the characteristics of the joints manufactured by the present invention are The fatigue strength is improved compared to the conventional one. Next, an example in which repair welding is performed by the method of the present invention to improve the fatigue strength will be described. First, when a stress range of 100 MPa was repeated, the conventional joint cracked at 1.72 × 10 5 times. Therefore, when the crack was removed and the cladding was repaired by the method of the present invention, and a stress was repeatedly applied under the same conditions, no crack was generated even if the life was extended to 40 times. FIG. 5 shows a distribution form of the welding residual stress along the plate width before and after the repair. With conventional fittings,
As shown by the broken line, the residual stress at the center of the sheet width is tensile, while the residual stress after repairing by the method of the present invention is compressive at the center of the sheet width.
【００１５】[0015]
【発明の効果】以上詳しく説明したとおり、この出願の
発明の方法によって、従来の溶接構造物で避けられなか
った、高い引張残留応力を複雑な溶接プロセスを用いな
いでも容易に圧縮とすることを可能とし、疲労強度向
上、溶接割れの防止を実現することができる。As described above in detail, the method of the present invention makes it possible to easily compress high tensile residual stress, which cannot be avoided in conventional welded structures, without using a complicated welding process. It is possible to improve fatigue strength and prevent welding cracks.
【００１６】複雑な溶接プロセスを用いずに、溶接部の
疲労強度向上、溶接割れの防止を可能とするため、溶接
構造の信頼性が高まり、かつ、工程の簡略性で経済効果
を発揮することにもなる。[0016] To improve the fatigue strength of the welded portion and prevent weld cracking without using a complicated welding process, the reliability of the welded structure is enhanced, and the economical effect is exhibited by the simplification of the process. Also.
【図１】実施例の角回溶接継手を例示した平面図と正面
図っである。1A and 1B are a plan view and a front view illustrating a corner welding joint according to an embodiment;
【図２】冷却にともなって拘束された、溶接金属に生じ
る応力の変化を示した図である。FIG. 2 is a view showing a change in stress generated in a weld metal, which is restrained by cooling.
【図３】シールドガスの種類による溶接金属の溶込み深
さの相違を示した図面に代わる断面写真である。FIG. 3 is a sectional photograph instead of a drawing showing a difference in penetration depth of a weld metal depending on a type of a shielding gas.
【図４】疲労Ｓ−Ｎ線図を示した図である。FIG. 4 is a diagram showing a fatigue SN diagram.
【図５】補修溶接による溶接残留応力分布を示した図で
ある。FIG. 5 is a view showing a welding residual stress distribution by repair welding.
１ 主鋼板 ２ 付加物 ３ 溶接積層 1 Main steel plate 2 Additives 3 Welding lamination
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ２２Ｃ 38/58 Ｃ２２Ｃ 38/58 (56)参考文献 特開 昭54−130451（ＪＰ，Ａ) 特開 昭50−92844（ＪＰ，Ａ) 特開 昭58−151987（ＪＰ，Ａ) 特開 昭58−141324（ＪＰ，Ａ) 特開 昭63−118017（ＪＰ，Ａ) 特開 昭58−173085（ＪＰ，Ａ) 特開 昭54−95952（ＪＰ，Ａ) 特開 昭64−83378（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 9/16 B23K 31/00 B23K 35/30 C22C 38/00 C22C 38/44 C22C 38/58 ────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 Identification code FI C22C 38/58 C22C 38/58 (56) References JP-A-54-130451 (JP, A) JP-A 50-92844 (JP) JP-A-58-151987 (JP, A) JP-A-58-141324 (JP, A) JP-A-63-118017 (JP, A) JP-A-58-173085 (JP, A) 54-95952 (JP, A) JP-A-64-83378 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B23K 9/16 B23K 31/00 B23K 35/30 C22C 38 / 00 C22C 38/44 C22C 38/58
Claims (4)
マルテンサイト変態膨張が終了する溶接材料と炭酸ガス
含有シールドガスとを用いて被溶接金属にアーク溶接を
行うことを特徴とする溶接方法。1. A welding method comprising performing arc welding on a metal to be welded using a welding material whose martensitic transformation expansion ends at or near room temperature at which welding is completed and a carbon dioxide-containing shielding gas.
金である請求項１の溶接方法。2. The welding method according to claim 1, wherein the welding material is an alloy containing Ni and Cr.
含有し、不活性ガスを含有する請求項１または２の溶接
方法。3. The welding method according to claim 1, wherein the shielding gas contains 10% or more of carbon dioxide gas and contains an inert gas.
３のいずれかの溶接方法。4. The welding method according to claim 1, wherein the welding is performed as repair welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25390398A JP3010211B1 (en) | 1998-09-08 | 1998-09-08 | Welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25390398A JP3010211B1 (en) | 1998-09-08 | 1998-09-08 | Welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP3010211B1 true JP3010211B1 (en) | 2000-02-21 |
| JP2000084670A JP2000084670A (en) | 2000-03-28 |
Family
ID=17257684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25390398A Expired - Lifetime JP3010211B1 (en) | 1998-09-08 | 1998-09-08 | Welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3010211B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004026519A1 (en) * | 2002-09-09 | 2004-04-01 | National Institute For Materials Science | Welding method using welding material of low transformation temperature |
| CN110819909A (en) * | 2019-11-21 | 2020-02-21 | 天津铸金科技开发股份有限公司 | High-temperature-resistant valve spray welding powder |
| CN111185691A (en) * | 2018-11-15 | 2020-05-22 | 天津大学 | High-toughness low-phase-change-point metal powder-cored welding wire |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001402A (en) * | 2001-06-21 | 2003-01-08 | Toshiba Corp | Wear-resistant member repairing method, repairing device used for repairing wear-resistant member, and steam valve |
-
1998
- 1998-09-08 JP JP25390398A patent/JP3010211B1/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004026519A1 (en) * | 2002-09-09 | 2004-04-01 | National Institute For Materials Science | Welding method using welding material of low transformation temperature |
| CN100418689C (en) * | 2002-09-09 | 2008-09-17 | 独立行政法人物质·材料研究机构 | Method of arc welding using welding material having low transformation temperature |
| CN111185691A (en) * | 2018-11-15 | 2020-05-22 | 天津大学 | High-toughness low-phase-change-point metal powder-cored welding wire |
| CN110819909A (en) * | 2019-11-21 | 2020-02-21 | 天津铸金科技开发股份有限公司 | High-temperature-resistant valve spray welding powder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000084670A (en) | 2000-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2005322594B2 (en) | Clad alloy substrates and method for making same | |
| Rozumek et al. | The influence of heat treatment on the behavior of fatigue crack growth in welded joints made of S355 under bending loading | |
| EP1108495B1 (en) | Welding material and a method of producing welded joint | |
| EP0850719B1 (en) | Welding method | |
| JP3010211B1 (en) | Welding method | |
| JPH11104865A (en) | Welding and welding structure | |
| JP4319886B2 (en) | Large heat input butt weld joint with brittle fracture resistance | |
| JP2002239722A (en) | Lap fillet welding method for steel sheet excellent in fatigue strength of weld zone | |
| JPS60213366A (en) | Electric welded steel tube excellent in sour resistance | |
| JP2004042133A (en) | Welded joint of excellent stress corrosion cracking resistance, and method for manufacturing the same | |
| KR100521560B1 (en) | Welding material for enhancing welded joint strength | |
| JP2002210557A (en) | Welding method utilizing maltensite transformational expansion | |
| JP2831903B2 (en) | Manufacturing method of iron-based sintered parts | |
| JP7376779B2 (en) | Welded joints and auto parts | |
| JP4465055B2 (en) | Welding method for structural steel | |
| JP4304892B2 (en) | Welded joint | |
| JPH106080A (en) | Welding material for building-up of journal part of high chrome rotor, high chrome rotor and production therefor | |
| JP3350727B2 (en) | Repair method and repair welding material for metal members | |
| JPH0819860A (en) | Method for welding boxing welding joint of construction steel | |
| JPH10146688A (en) | Welding joint | |
| JP2001342536A (en) | Joint steel sheet having differential thickness and high friction | |
| JPS6224868A (en) | Reinforcement structure for corner part receiving high stress concentration | |
| JP2005246403A (en) | High strength welded steel pipe excellent in brittle fracture characteristic in weld zone | |
| RU2279339C2 (en) | Open electric arc welding method, welded seam and consumable welding electrode | |
| Watanabe et al. | Gas Metal Arc Welding of 9% Nickel Steel Using Ferritic Filler Metal Used for Building LNG Transport Tanker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |